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#include <bits/stdc++.h>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,G,i,g,w[5001],p[5001],u,v;
long long aux,dp[2][10001];
/// 10.000*8=80.000+4*10.000= 120.000
int main()
{
fin>>n>>G;
for(i=1; i<=n; i++)
fin>>w[i]>>p[i];
u=0;
v=1;
for(i=1; i<=n; i++)
{
for(g=1; g<=G; g++)
{
dp[v][g]=dp[u][g];
if(w[i]<=g)
{
aux=dp[u][g-w[i]]+p[i];
if(aux>dp[v][g])
dp[v][g]=aux;
}
}
u=1-u;
v=1-v;
}
fout<<dp[u][G];
return 0;
}